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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dde6413c461ddf7f4a341984192510b807b58da44f97f82fad881ed1e0c7f8' 
  AND token = 'tgL/stn9yVqHpa1ZxA3iWDDO/XrX1T3sKCSTInlyhZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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