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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2b0d20af9b15aee24b40ace26602e255e8710c9e68d5d0661467b22a9691b7' 
  AND token = 'Q851GkAsaVI6ocGQxnpBcM3Ct68ESQ4b1Rt5O14n4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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