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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e28fd84b37c154d54363c75e3afd49a943a31a2583a5352e7886908cc3364ac' 
  AND token = 'fNttSEF3g11MIky8JOlU+7+NaTZeF55boyrO0tmLgYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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