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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb237e5a0158a1896cb3d14539b3c4e626d7064c6a2d9c895303d03dc7c8619' 
  AND token = '8PiYpwhvNVcgdSmfR0Df8rSNEyVLS0acwDzZFJT91xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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