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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d8f9ea42734540b1a29edf9756abce6f7ac745ba72c31adc15d40aa0e93f31' 
  AND token = 'S5T/E5lZKWRr9KsQo3+8d58NUsTwwWJugc/RimgMit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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