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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f35f1bfbbba72ad3b28d5bf3ad5014f5f1eb3b6335d575e62dad9d2864b32' 
  AND token = '+481tvwgji/sYeJsVGQDMfaDQbysW1cdenNxduQykzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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