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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126ef6a05b39b88541a4a718f656bf8528698ea600066b53c375ebe3d7fb7326' 
  AND token = 'o+llT/7asETkrQF8RGPBf7V1I5/DGU7yBi8u98cq5aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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