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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9260e402f06d70024038e3d028246974ae28062910328cbb421b0bc21dbac4ea' 
  AND token = 'ohGUJRcljRb4ol6zpnE4S5JgJshq+VtZt/U7NrybNoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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