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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ccc89b0b9e4d2fcfdea675cf2c0bbbc393d46d5e339821bc9af2f593221093' 
  AND token = 'I0v/MHJkgjC3DrL3BpY6jWwZmUVc6MTAin9I9vPvMV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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