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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02be5f52524d2e22def9e6af955abbfb2252dec80b1797e767bec533b7a34ac7' 
  AND token = 'EqUeK1BHiuI376wEqUDYgT69MKJPgwACt+yp6+iIB5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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