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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb203b69a2904dd3054d55b66c9905323b122749433cbea1ddb8be1385f436c0' 
  AND token = 'bIku5LMiPZxHALTn/rTHM8YT2lOcLGKXjrl6pGqicD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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