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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b527bfbaf0be0a049e1de4aeb4e5ccb9e5cb05dfd66758b7e6a7da0bc5efdde' 
  AND token = 'BbPpJag2h7Betq8TgoAxaUxkZtKbMrpm//8cmhL+sG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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