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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8e9e146f89f3c690e71095b8c992f2871e1569522022cd71b90e1b77ad257a' 
  AND token = '/nVypbppDJ2LbtLJXC7E9985CZ1LhkEJqlytIEO+2UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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