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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763ecb1096348c3ba3ea682f74ab382b9678923610d9b01c729f6237c5ea4fe7' 
  AND token = 'bJkbuaSE1Rd96v/9BJYLmAWa4VtUjv32BZTTsDHFipo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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