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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232c75bf48b0cddbc69cfd8bd21fd4846323e71e394736f25362fabf866d00f3' 
  AND token = '3DzyC3YIVAyda4aFzTW6L0Ik7key0NxvMm7AfUH9MdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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