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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1407bc065cee357cc1638ac75b0bea6b0ce4945698f2f235d56200af8984f6' 
  AND token = '9PeUaRYQ3iq9pdgwJWAyb3mYv8EI7tvWeCsSNJcBAD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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