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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c41961637133ded8ec0dec54426c56fa0107c344acf4c9ef5dc74e53c71bcb' 
  AND token = '/jl9eakKcVPMzdRkk9Fnwd1IMEsgSbQ7nNMpsWj2PXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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