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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfb8ef3ae93e0faabb5e22fa7ec4240248363fc1857e31cade7b113d953eb2d' 
  AND token = 'M8kLTu4M/J3MLSxVPn/dYQU38XqCO2E7o/sWKmn5zJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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