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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fc7ca73badf2a06450563730cf6b80074dd32e917cc1748a2ca8bfd9fc5bf7' 
  AND token = 'ZuWTO4A3faoA7p1Ql/i+ScJSdPtHe3ywGFaIVf8SM1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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