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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc5e92e95be368d1ed7e38ba18f251e6ecf70156afcc66bd493fa6a8632e0f2' 
  AND token = 'M+SGkBMYc8ZSAGAAdOIvUJ5b3dDkz355dLWgdWi1zqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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