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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5afc76f044eabf337397eb5b8346736d6b532e6303b299b73421470b087e1ae' 
  AND token = '10nzVepLq32pBrdjBcGXfEX3BHNMHHE/LId1mpDEhwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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