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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d05426d9d121acd35fed98ee772218de5c2baa4f31cc16a1dcecaffe9f3ea4' 
  AND token = '7wPj7dFspxBTRz2duzb7NwEbyAcCeGEXWl1U/DYj5NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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