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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8fa7dba2558f5958e93e5b52d50fb6093718c9c3dbd77a16287b0e0279f8a5' 
  AND token = '6Bem5CvZiiQeeGQo5g/Ie9FVI6ocDNUKBS0Q1ab8Aek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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