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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb03f133adc4fdf2bc4fa65d060f53b7577b00ebb6ca4d2594c956e085ec371' 
  AND token = 'vNl3sYfCq9d47y6VF1YcBnC8u107k8kisR6c7n2QC74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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