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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f969b16d49490f77c8b54cba767af9e337488b69830570774b9b5eb19f2a522' 
  AND token = 'e8l+XitisY+OQ4gAyggqs/ggvYf43EII8I2QJuSLrcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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