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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17475af32bc0a7b75785e60c9b27d108b74b1906eac59b1314dcc37a36910f4b' 
  AND token = '50t9nzFdB0QTo+57cPrSjxxiiA8AC5b2Ixxg+L9mbCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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