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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d9ad522eb24d48875b629e620d4fb58fe267e7610b48a8efa3c034cf90ed84' 
  AND token = 'iAM2k4d2w9p1X42H7dp9JttPH+FMuGOju1n8PKNIh9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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