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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb96327cfb62f274d1bb40dc04e3cde3fb8ce324413589069ae9c42453cbd92' 
  AND token = 'lK/+cNh7h2eAA9epr/efuTqiR02YkMRuYqNU404KQPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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