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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b537c192061bb498e00f8cff9aa81bd6ddf37da7a0674b5f79fa044d774ee5' 
  AND token = 'V1zPjfWoLuOjF/Ly6NOLSWBW9W4da2rHBiCDh4unjkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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