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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e818ddcc67a35d0371c7e564c02e683e9c60a59a44bd3f23a734211848cd9e4' 
  AND token = '0bllVWeZRqqbfJXu0fpex1PRfIsCZm6CmMTp19AAA6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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