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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fc18cbc9a32c280452630c1dbc7a39e757731a07947c89ad2d407a574ea73a' 
  AND token = 'hSh1Aykp6OSa/YhhnvVRsYs3EKhnDUkwRJv8YeYXAOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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