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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11589026891ce91eb03f8772a16a2ced2b10509175bb5d9ff2e4e7df7da270b9' 
  AND token = 'EwHXC64vGnsH+//brbQI/pqdOD62l0eLwE/S8T3fK+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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