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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77dc419ee5fd1af1c3f3c55b86ae33b5cc56f46ba4712bdd8765ffbd573e852' 
  AND token = 'rl4pCXc6F22Nshu2XocpABOPdcAMkPBCtMKtWyjgIyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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