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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793bf2f77b8868245248fc2ccbfc95897d2ae46db951e151f814f246ba694e95' 
  AND token = 'CCODYyIR8+80wAC84uOEm7s649k0Lbe43bZAH5hVrBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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