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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f1aa99f7ae0769bfa70fda5ad292649add050d7e135b2713717cdf458c6678' 
  AND token = 'Mzfah/Qt9VI4cE0nMXHxmDem0ypIsG5CtqiskpYjnOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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