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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0379b17d596ec75056f57d6ad765d34c9bbf608c6b222607ce69f2c385b140b' 
  AND token = 'H85iO1oSSwF9R9y3Qw8x4EchOs0JS7sNaTx9zOlGMO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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