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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2bd55ae4b2e36212bf4f5d9aabfe4102de6e5baeb1516ce6c3cd9e4cbf57fc' 
  AND token = 'AbX6vOdqem4QxBp7Y1MZt8hTpRDQg6MmgR1kO590YyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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