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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe0d1a95d5b97d0bf5365df456e276df244f93a15b2f7554e229673aef76567' 
  AND token = 'T4jrum+Dz1g2tEinwGTnBNAvwwxHPSOjkMpRWe6olP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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