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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce411864cf9e68b82e83556d935ed1c4334f1b26ae99e8151fdd8e439e66738' 
  AND token = 'Ro8KuglnsPegA2VKPr/ymgOjsSp4G4tLfboifooKaBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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