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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e327b55db4ecce4d63f6d321b14947c520e7e41ea7803c874d7bd78447fa13d1' 
  AND token = 'R3kDbh8fIJ2oj8lpwg7XPwNbupDAcXANlxVFnkMIk28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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