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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2172a3a0e5d376ba87408c7aa3764ca88d6751abd3e626aebabb6e75468c5a' 
  AND token = 'hE7SaEMj976OQw0pn6+j3pAY3SktZVmdmyJiJwV/3xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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