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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76be8f9ba34c8873daba4d324fc0aa44fcf8bb8d52786aa6a0b57e02917119d' 
  AND token = 'ZQLOu/UzsVv27IO7dw++mTKsdvNLkNx5O7NSUOwQhWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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