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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ea996ae5c6ef8d97a8681441fcdae1bcf4146a484cfe53414d565844da2f5c' 
  AND token = '6yfSUELMeJnLBW/0eE54r9MP3py8/peTIgsgkvFw9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}