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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d3d2bc5b60ca0c209633720a0d273384683f8aee5383b95a3f5f631cacf18c' 
  AND token = 'YSK2CkhYvdBkyi7B9h6f5+BsUZBn0i9Azt+fdTZ7/Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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