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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41e4f47b8565a6fdd31219b2e4078dbbc3e4cbfae3a48ec7bc36c0611d4f65c' 
  AND token = 'U0+5yKOfha+KcAx+wXxCEOEOtnX6nMkC+ryLw1KTYwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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