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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9697c6afa4ef12da6e6c4b1bef372a24f4184608fa8cfade09448db0ebe6be8' 
  AND token = 'LayqGOePj4jweZ2zDGx2i0DDLCgTML9lQPbC3cZmeRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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